Why Garbage Collection take more time on JRockit?

My company use 
BEA WebLogic 8.1.2 
JRockit version 1.4.2 
Window 2003 32bit 
RAM 4 Gig 
 
-Xms = 1300 
-Xmx = 1300 
and running ejb application. 
My problem is why JRockit take more time. How Can I solve this problem. Because my application will down again.
 
This is my infomation on JRockit :
 
Gc Algorithm: JRockit Garbage Collection System currently running strategy: Single generational, parallel mark, parallel sweep.
 
Total Garbage Collection Count: 10340
 
Last GC End: Wed May 10 13:55:37 ICT 2006
 
Last GC Start: Wed May 10 13:55:35 ICT 2006
 
Total Garbage Collection Time: 2:53:13.1
 
GC Handles Compaction: true
 
Concurrent: false
 
Generational: false
 
Incremental: false
 
Parallel: true

Hi,
I will suggest you to check a few places where you can see the status
1) SM37 job log (In source system if load is from R/3 or in BW if its a datamart load) (give request name) and it should give you the details about the request. If its active make sure that the job log is getting updated at frequent intervals.
Also see if there is any 'sysfail' for any datapacket in SM37.
2) SM66 get the job details (server name PID etc from SM37) and see in SM66 if the job is running or not. (In source system if load is from R/3 or in BW if its a datamart load). See if its accessing/updating some tables or is not doing anything at all.
3) RSMO see what is available in details tab. It may be in update rules.
4) ST22 check if any short dump has occured.(In source system if load is from R/3 or in BW if its a datamart load)
5) SM58 and BD87 for pending tRFCs and IDOCS.
Once you identify you can rectify the error.
If all the records are in PSA you can pull it from the PSA to target. Else you may have to pull it again from source infoprovider.
If its running and if you are able to see it active in SM66 you can wait for some time to let it finish. You can also try SM50 / SM51 to see what is happening in the system level like reading/inserting tables etc.
If you feel its active and running you can verify by checking if the number of records has increased in the data tables.
SM21 - System log can also be helpful.
Also RSA7 will show LUWS which means more than one record.
Thanks,
JituK

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Garbage Collection take long times.....

*** NOTES 19-JUN-2001 10:27:33 [20-JUN-2001 00:27:33 ASST3] websupport
*** Logged by contact: Weber Wang, 2-87705935 ext. 63
Product Name and Version, including Service Pack (if any):
=============================================
weblogic6.0sp2
Platform (OS Version)
=================
solaris2.7
JDK Version (if applicable)
=====================
jdk130
If your problem relates to a 3rd party product (JDBC driver, database, or web/proxy
server), please provide vendor name, product name, version number
==============================================================================================
Detailed Problem Description
======================
we have set java parameter to start up weblogic server ,but got the Garbage Collection
time too long...it cause browser halt...when Garbage Collection
will do a Full GC?and will it degrade weblogic's performance?
java -server -verbose:class -verbose:gc -verbose:jni -XX:newSize=512m -XX:MaxNewSize=512m
-Xms768m -Xmx768m -XX:SurvivorRatio=2
Error Message/Stack Trace
=====================
[Full GC 65065K->27729K(65216K), 1.2891364 secs]
[Full GC 49079K->28008K(65216K), 1.0507784 secs]
[Full GC 65111K->29714K(65216K), 1.1813595 secs]
[Full GC 51063K->29988K(65216K), 1.0506374 secs]
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[Full GC 49216K->28146K(65216K), 1.0534394 secs]
[Full GC 65095K->29993K(65216K), 1.6070138 secs]
[Full GC 51343K->30182K(65216K), 1.3617954 secs]

I think your young generation size is waaaaay too high - its performance
impact becomes negative at or around 1/2 of the total heap size.
weber <[email protected]> wrote:
*** NOTES 19-JUN-2001 10:27:33 [20-JUN-2001 00:27:33 ASST3] websupport
*** Logged by contact: Weber Wang, 2-87705935 ext. 63
Product Name and Version, including Service Pack (if any):
=============================================
weblogic6.0sp2
Platform (OS Version)
=================
solaris2.7
JDK Version (if applicable)
=====================
jdk130
If your problem relates to a 3rd party product (JDBC driver, database, or web/proxy
server), please provide vendor name, product name, version number
==============================================================================================
Detailed Problem Description
======================
we have set java parameter to start up weblogic server ,but got the Garbage Collection
time too long...it cause browser halt...when Garbage Collection
will do a Full GC?and will it degrade weblogic's performance?
java -server -verbose:class -verbose:gc -verbose:jni -XX:newSize=512m -XX:MaxNewSize=512m
-Xms768m -Xmx768m -XX:SurvivorRatio=2
Error Message/Stack Trace
=====================
[Full GC 65065K->27729K(65216K), 1.2891364 secs]
[Full GC 49079K->28008K(65216K), 1.0507784 secs]
[Full GC 65111K->29714K(65216K), 1.1813595 secs]
[Full GC 51063K->29988K(65216K), 1.0506374 secs]
[Full GC 64951K->27867K(65216K), 1.1312621 secs]
[Full GC 49216K->28146K(65216K), 1.0534394 secs]
[Full GC 65095K->29993K(65216K), 1.6070138 secs]
[Full GC 51343K->30182K(65216K), 1.3617954 secs]--
Dimitri

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Hi,
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Hi Senthil,
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Why import of change request in production takes more time than quality?

Hello All,
why import of change request in production takes more time than import into quality?

Hi jahangeer,
I believe it takes same time to import a request in both quality and production as they will be in sync.
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Why view have no stored data ? And what is the reason view take more time

Why view have no stored data ? And what is the reason view take more time to query ?
what happen if a view have stored data?

user12941450 wrote:
I want to know the reason that why querying view is slower then querying a normal table?..Untrue.
For example take a table with 2laks record and a view for that table.
If i make a query like( Select name,address from table) then it works fast then select(name,address)from view..Incorrectly interpreting the results.
A view is a SQL statement. Only difference is that the SQL statement is stored in the database's dictionary. Let's consider the following view:
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Oracle coherence first read/write operation take more time

I'm currently testing with oracle coherence Java and C++ version and from both versions for writing to any local or distributed or near cache first read/write operation take more time compared to next consecutive read/write operation. Is this because of boost operations happening inside actual HashMap or serialization or memory mapped implementation. What are the techniques which we can use to improve the performance with this first read/write operation?
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In which case, why bother using Coherence? You're not really gaining anything, are you?
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Just my two cents.
Cheers,
Steve
NB. I don't work for Oracle, so maybe they have a different opinion. :)

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Hello, My database is oracle11g.
I have same plsql code and first one is without bind variable and second one is with bind variable. Usually, bind variable should take less time. But here
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SQL> alter system flush shared_pool;
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2 cursor c1 is select * from emp where rownum < 50;
3 l_start NUMBER DEFAULT DBMS_UTILITY.GET_TIME;
4 v_cnt number;
5 begin
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7 SELECT count(*) into v_cnt
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10 FROM ratedetail
11 WHERE benefit_id = i.benefit_id)
12 AND effective_date =
13 TO_DATE ('2011-01-23 00:00:00', 'yyyy-MM-dd HH24:MI:SS')
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System altered.
SQL>
SQL> declare
2 cursor c1 is select benefit_id from emp where rownum < 50;
3 l_start NUMBER DEFAULT DBMS_UTILITY.GET_TIME;
4 v_cnt number;
5 begin
6 for i in c1 loop
7 execute immediate 'SELECT count(*)
8 FROM rate
9 WHERE rate_id IN (SELECT rate_id
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12 AND effective_date = trunc(sysdate)-202
13 AND rate_type_id = 1'
14 into v_cnt using i.benefit_id;
15 end loop;
16 DBMS_OUTPUT.PUT_LINE('total minutes....'||ROUND(ROUND((DBMS_UTILITY.GET_TIME - l_start)/100, 2)
/60,3));
17 end;
18 /
total minutes.....061
PL/SQL procedure successfully completed.
SQL>

Shrinika wrote:
Thanks for the clarification.. Now i understand...
One final question on this thread before i close this thread....
My database is set to CURSOR_SHARING=FORCE for some reason. It seems somebody applied a "quick and dirty fix" to "database is slow" problem. BAD PRACTICE
My question is, when we use bind variable, does it parse the sql code every time? or does it reuse the execution plan?
In my database, it reuse the execution plan... Just checking... When we set CURSOR_SHARING=FORCE, it should generate the execution plan
for every unqiue sql code... Is that correct? Am i confusing?If by "parse" you mean a "hard parse" (which generates execution plan), then the answer is NO. As you observed, it reuses execution plan.
For e.g. with CURSOR_SHARING=FORCE setting, following SQLs
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select employee_no, first_name, last_name from employees where dept_no = :SYS01 ;Hope this helps.
Edited by: user503699 on Aug 14, 2010 3:55 AM

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Hi all
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Query
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psb_ws_line_balances_i b ,
gl_budget_versions bv,
gl_budgets_v gv
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Hi,
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When i am developing the adobe interactive form Using designer 7.1.3129.1.296948,After that I converted to PDF.
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Hi,
I have seen this exact same problem happening when, I created/developed a adobe form, on a PC which had adobe livecycle designer 7.1, but had adobe reader 7.
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Hi Experts,
I m using 'BAPI_GOODSMVT_CREATE' in my custom report, it takes more time for creating Material documents.
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Hi,
please check if some of following OSS notes are not valid for your problem:
[Note 838036 - AFS: Performance issues during GR with ref. to PO|https://service.sap.com/sap/support/notes/838036]
[Note 391142 - Performance: Goods receipt for inbound delivery|https://service.sap.com/sap/support/notes/391142]
[Note 1414418 - Goods receipt for customer returns: Various corrections|https://service.sap.com/sap/support/notes/1414418]
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Hi,
please check if some of following OSS notes are not valid for your problem:
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[Note 391142 - Performance: Goods receipt for inbound delivery|https://service.sap.com/sap/support/notes/391142]
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Values in Where clause are as follows
OBNJR in ( KSBB010000001224 BT KSBB012157221571)
GJAHR in blank
VERSN in '000'
WRTTP in '04' and '11'
all others are blank
VT_VAR_COND = ( CPUDT BETWEEN '20091201' and '20091208' )
SELECT (VT_FIELDS) INTO CORRESPONDING FIELDS OF GS_COVP_EXT
                    FROM (V_DB_TABLE)
                    WHERE LEDNR = '00'
                    AND   OBJNR IN LR_OBJNR
                    AND   GJAHR IN GR_GJAHR
                    AND   VERSN IN GR_VERSN
                    AND   WRTTP IN GR_WRTTP
                    AND   KSTAR IN LR_KSTAR
                    AND   PERIO IN GR_PERIO
                    AND   BUDAT IN GR_BUDAT
                    AND   PAROB IN GR_PAROB
                    AND   (VT_VAR_COND).
Checked in table for this condition it has only 92 entries.
But when i execute program takes long time as 3 Hrs.
Could any one help me on this

>1.Dont use SELECT/ENDSELECT instead use INTO TABLE addition .
> 2.Avoid using corresponding addition.create a type and reference it.
> If the select is going for dump beacause of storage limitations ,then use Cursors.
you got three large NOs .... all three recommendations are wrong!
The SE16 test is going in the right direction ... but what was filled. Nobody knows!!!!
Select options:
Did you ever try to trace the SE16? The generic statement has for every field an in-condition!
Without the information what was actually filled, nobody can say something there
are at least 2**n combinations possible!
Use ST05 for SE16 and check actual statement plus explain!

Why Garbage Collection take more time on JRockit?

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